Duplicating mechanism



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@viva-ys April 219315. H. JAGGER Er AL DUPLIGATING MECHANISM Filed Manin 29, 195s Patented Apr. 2, 1935 UNITED STATES pePLicA'rING MEoHANIsM Application March 29., 1933, Serial No. 663,416

10 Claims. (Cl. 101-133) T OFFICE- The invention relates to duplicating mecha- Fig. 3 is a sectionftaken on the same line as nism and is particularly adapted to be embodied Fig. 2, but showing 'some parts Vof the mechanism in duplicating machines of the flat bed type. in changed positions.

A. preferred form of the invention is embodied -Fig. 4 is a section takenzon the same line as 5 in a hectograph machine which comprises a flat Figs. 2 and 3, but showing some ofthe parts in 5 platen over which a gelatin band is disposed. A changed positions. f' carriage slidably mounted in the machine may be Fig. 5 is a'section taken on line 5 5 of Fig. 2. reciprocated over the gelatin band to feed sheets Fig. 6 is a section taken on line 6-5 of Fig. 5. to be duplicated to the gelatin band and to strip Fig. '7 is a Ifragmentary side elevation of one l them therefrom. The carriage is provided with of a pair of levers which carry a margin bar 10 platen and pressure rolls and a paper tray which embodying the invention.

guides the sheets to be duplicated between the Fig. 8 is a section taken on line 8-8 of Fig..2, platen and pressure rolls. The platen roll is roand tatably journaled in a yoke pivoted in the car- Fig. 9 is a fragmentary perspective view of i riage, a handle being provided whereby the operthe improved margin bar. A 1.5'

ator of the machine may oscillate the yoke to Referring now to the drawings wherein a preraise and lower the platen roll, the platen roll ferred embodiment of the invention is illustrated, being'lifted out of its functionally operative posithe reference character It designates `generally tion with respect to the pressure roll andthe the frame of a hectograph machine of the fiat gelatin band when a sheet to be duplicated is to bed type. 'Ihe machine comprises a platen Il 20 be fed between the platen and pressure rolls. secured to the' frame by Vthe screws I2 (Figs. 1

Improved means is provided for alining the and 2). Slidably journaled in the frame I0 and forward edges of the sheets to be duplicated. adapted to be reciprocated over the platen Il is This means comprises an angle shaped margin a carriage which is designated generally by the bar xed to the free ends of spaced arms or reference character I3. The carriage I3 com- 25 levers which are pivoted in the carriage and are prises a frame I il provided with a paper feeding adapted to displace the margin har into and out tray or guide I5. A shaft I'I journaled in the of its functionally operative position withrespect carriage frame I4 is provided with a handle I8 to the platen roll. The means for displacing the whereby the operator of the machine may oscilmargin bar comprises a lost motion connection late the shaft to raise and lower a platen roll 30 between the levers and the yoke which journals I9, the platen roll I9 being journaled in arms the platen roll. Means is provided for yieldingly or levers 20 fixed tothe shaft II. "The shaft I'I holding the margin bar in its functionally operand the levers 20 form a yoke. Rotatably jourative position during the time a sheet of paper is naled in the carriage frame I4 is a pressure roll being fed between the platen and pressure rolls 2l preferably formed of metal. The platen roll 35 and during the time the platen roll is being low- I9 co-operates with the pressure roll 2l to feedA ered to clamp the paper between itself and the sheets of paper to: a gelatin band 23 trained pressure roll. This insures that the sheets to over the platen II. The platen roll I9 is prefbe duplicated will be alined properly with the erably formed from sponge rubber and is prefdata on the gelatin band. erably more yielding than the gelatin coating The carriage is provided with means actuated of the gelatin Yband 23. Pivoted on one of the by the yoke for rotating the pressure roll during levers 20 by a screw 25 is a rack barr 26 having the downward movement of the platen roll so that teeth engageable with a pinion 2l constrained the forward edge of a sheet of paper disposed to rotate with the pressure roll 2l. (See-FigLG.) between the platen and pressure rolls will not The rack bar 25 is urged yieldingly against the be withdrawn from engagement with the margin pinion 21 by a leaf spring 28 fixed to the carbar. riage frame It by bolts 29. The free end of the Other objects and advantages will become apleaf spring is engageable with a notch 3| formed parent as the following detailed description proin the rack bar 26, the construction being such gresses, reference being had to the accompanying that when the platen roll IS isvin its raised or drawings, 'whereinfunctionally inoperative position as illustrated Fig. l is a plan elevation of a duplicating main Figs. 2 and 3, the free end of the spring 28 chine which embodies the invention. rests in the notch 3l and yieldingly prevents Fig. 2 is an enlarged section taken on line displacement of the rack bar so that through 2-2 of Fig. 1 Y the medium of the associated lever 20 and the shaft I 'I the handle I8 is held in the position wherein it is shown in Fig. 2. So long as the lever remains in the position wherein it is shown in Fig. 2, the platen roll I9 is retained in its functionally inoperative position. When the handle I8 is displaced angularly in a clockwise direction (Fig. 2) to lower the platen roll It, the rack bar 25 will rotate the pressure roll 2l in a counter-clockwise direction (Fig. 6) to prevent counter-clockwise rotation of the platen roll I3, which counter-clockwise rotation of the platen roll would tend to withdraw the sheets being fed into the machine from a margin bar hereinafter described. It will be noted Vthat when the platen roll i9 is in its lowermost position, the teeth of the rack bar 23 do notengage the pinion 27. Means is provided for locking the platen roll i9 in its lowermcst position.

Y This means comprises a latch member 35 pivoted to the carriage frame i4 by a pin 35. The latch member; 35 is provided with an arm 3'.' engagea-ble withy a-wear plate 33 on one of the levers 29. The latch member 35 is provided with another arm 35 engageable by a dog 4Q fixed to a shaft 42 provided with a lever 43 (Fig. l) whereby the shaft i2 may be displaced angularly to cause the dog lto disengage the latch member 35 from the wear plate 38. The latch member 35 is also provided with an extension 42a engageable by a dog Ali pivoted in the frame i3,

' the construction beingsuchthat when the carriage I3 isreturned to its home position at the right hand end (Fig. 1) of the frame Iii, the dog M will engage the extension 52a and disengage the latch member 35. from the wear plate 38. The latch member 35 is urged yieldingly into its locking positionby a spring 46.

The mechanism described above is substantially identical with that shown and described in the co-pending application of Alfred Marchev and John W. Hernlund, Serial Number 663,404, filed March 29, 1933. I'he operation of the mechanism is substantially as follows: When a sheet is to be duplicated, it is placed in the pavper guide or tray I and permitted to gravitate down between the platen roll I9 and the pressure roll 2l until it abuts against a margin bar 58, the platen rollIS being in its uppermost position at this time (Fig. 2) The handle I8 is then displaced angularly by the operator in a clockwise direction (Fig. 2) to lower the platen roll I 9 and it will be `readily understood from an inspection of Fig. 3 that when the platen roll I 9 engages the pressure roll 2I there is a tendency of the platen roll I9 to rotate in a counter-clockwise direction (Fig. 3) so that it will withdraw the forward edge of the paper from engagement with the margin bar. Such counter-clockwise rotation of the platen roll I9 is prevented by the rack bar 25 which rotates the pressure roll 2| in a counter-clockwise direction (Fig. 3) and thus causes it to rotate the platen roll I9 ina clockwise direction (Fig. 3). This rotation of the platen and pressure rolls holds the forward edge of the paper in engagement with the margin` bar 5B and also provides sufficient paper to form the curve or bend 46 therein when the platen roll is lowered from the position wherein it is shown in Fig. 3 to the position wherein it is shownv in Fig. 4. It will be readily understood, of course, that the rack bar 26 and the pinion 21 may be proportioned and designed to rotate the pressure roll through any desired angle. In the present instance, the rack bar and the pinion insure that the forward edge of the paper will be positioned directly beneath the axis of rotation of the platen roll I9 when the platen roll is in its lowermost position (Fig. 4).

The margin bar 5I) is preferably formed from sheet metal and is preferably angle shaped. At its ends, the margin bar 5i] is provided with integral lugs 5I which are riveted to the free ends of arms 'or levers 52 pivoted at Vtheir upper ends to the carriage frame I4, pins 55 being provided for this purpose. The upper end of each lever '.52 is rounded and is provided with a V-shapedf` notch 51. The outer edges of the V-shaped notches are flattened as at 58 to abut against the flat bottomsurfaces of plungers Ii when the margin bar is in its functionally operative position as illustrated in Figs. 2, 3 and 8. The plungers 6I) are preferably tubular and are urged toward the levers 52 by springs 5I, the plungers being slidably journaled in the carriage frame I 4. The `flat surfaces 58 are relatively small in area but of sufficient size to insure that the vibration of the carriage frame will not cause displacement of the margin bar from its functionally operative position.

The levers 52 are oscillated during the operation of the machine to bring the margin bar 50 into and out of its'functionally operative position. Thus, each time the carriage I3 is returned to its home position anda new sheet of paper is fed into it, the margin bar 5G is held in the position wherein it is illustrated in Fig. 2. Then when the handle I8 is displaced in a clockwise direction (Fig. 2) to lower the platen roll I9, the margin bar I5 is retracted to the position wherein it is illustrated in Fig. 4. Subsequently, when the platen roll I 9 is raised to its uppermost position, the margin bar 56 is returned to the position wherein it is illustrated in Fig. 2. The means for oscillating the levers 52 to displace the margin bar 53 into and out of its functionally operative position preferably comprises links 65 pivoted to the levers 2i) by the pin 25 and a pin 25a. The free ends of the levers 65 are rprovided with slots 53. Pins SB projecting from the levers 52 ride in the slots 66 to provide lost motion connections between the levers 65 and 52. When the margin bar 50 is in its 'functionally operative position, the pins 68 rest against the inner ends of the slots 66 (see Fig. 2) so that the initial displacement of the lever I 8 from the positionwherein it is shown in Fig. 2 to the position wherein it is shown in Fig. 4 does not result in any displacement of the margin bar 50 as the pins 63 simply ride in the slots 63 until the platen roll I9 has clamped the paper to be duplicated between itself and the pressure roll 2| At this time, the pins G8 are engaging the outer ends ofthe slots 6B and continued displacement of the handle I8 in a clockwise direction (Fig. 4) causes the levers B5 to retract the margin bar 58 to the position wherein it is shown in Fig. 4. It will be noted that kthe margin bar 50 is withdrawn from the downward path of the platen roll 9| during the last portion of its downward stroke. When the handle I8 is displaced subsequently to raise the platen roll I 9, the lost motion connection between the levers 65 and the levers 52 permits the margin bar 5D to remain in its retracted position until the platen roll has been withdrawn from its path.

When the margin bar 5I! is in its retracted position, the at bottom surfaces of the plungers 60 frictionally engage the rounded upper ends of the levers 52 and prevent accidental displacement of the margin bar.

While we have shown and described certain embodiments of our invention, it is to beunderstood that it is capable of many modifications. Changes, therefore in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is our intention to claim all novelty inherent in our invention as broadly as possible, in view of the prior art.

We claim:

l. In a duplicating machine, a platen, a carriage mounted to be reciprocated over said platen, a yoke pivoted in said carriage, a platen roll journaled in said yoke, a pressure roll journaled in said carriage, a margin bar, and a single link between said yoke and said margin bar provided at one end with a lost motion connection.

2. In a duplicating machine, a platen, a carriage mounted to be reciprocated over said platen, a platen roll, means movably mounted in said carriage for journaling said platen roll, a margin bar, and a single link forming a lost motion connection between said movably mounted means and said margin bar, said link being carried at its opposite ends by said margin bar and said movably mounted means respectively.

3. In a duplicating machine, a platen, a carriage mounted to be reciprocated over said platen, a yoke pivoted in said carriage, a platen roller journaled in said yoke, a margin bar, 1evers pivoted in said carriage and carrying said margin bar, a spring pressed plunger frictionally engaging one of said levers, and means operatively connecting one of said levers to said yoke.

4. In a duplicating machine, a platen, a carriage mounted to be reciprocated over said platen, a yoke pivoted in said carriage, a platen roll journaled in said yoke, a margin bar, levers pivoted in said carriage and carrying said margin bar, means frictionally engaging one of said levers for holding it yieldingly in a predetermined position, and means including a lost motion connection between said yoke and one of said levers.

5. In a duplicating machine, a platen, a carriage mounted to be reciprocated over said platen, a yoke pivoted in said carriage, a platen roll journaled in said yoke, a margin bar, levers pivoted in said carriage and carrying said margin bar, one of said levers having a notch in its pivoted end, spring pressed means frictionally engageable with said notched end to hold said lever yieldwith the first mentioned flat surface to retain said lever yieldingly in a predetermined position, and

means operatively connecting one of said levers to said yoke.

7. In a duplicating machine, a platen, a carriage mounted to be reciprocated over said platen, a yoke pivoted in said carriage, a platen roll journaled in said yoke, a margin bar, levers pivoted in said carriage and carrying said margin bar, one of said levers having a substantially flat surface at its pivoted end, a spring pressed plunger having a substantially fiat surface engageable with the rst mentioned at surface to retain said lever yieldingly in a predetermined position, and means including a lost motion connection between said yoke and one of said levers.

8. In a duplicating machine, a platen, a carriage mounted to be reciprocated over said platen, a platen roll, means movably mounted in said carriage for journaling said platen roll, a margin bar, a single link providing a lost motion connection between said movably mounted means and said margin bar, and a spring held latch for locking said platen roll in a functionally operative position with respect to said platen.

9. In a duplicating machine, a platen, a carriage mounted to be reciprocated overA said platen a platen roll, means movably mounted in said carriage for journaling said platen roll, a margin bar, means for yieldingly holding said margin bar in a predetermined position, and means including a lost motion connection between said movably mounted means and said margin bar.

10. In a duplicating machine, a platen, a carriage mounted to be reciprocated over said platen, a platen roll, means movably mounted in said carriage for-journaling said platen roll, a margin bar pivoted in said carriage, means for holding said margin bar yieldingly in a predetermined position, and a lever connecting said movably mounted means to said margin bar.

HUBERT JAGGER. JOHN W. HERNLUND. 

